Oil filter screen



March 2, 1948.

2 s. Mm E RE.% Hm i 3 Q T L, Mi O VLR OG I alum; 7 C 4 m 2 [N V EN TOR.

Patented Mar. 2, 1948 UNITED STATES PATENT OFFICE v y I 2,437,008

OIL FILTER SCREEN George van Doehren, Fredericksburg, Iowa ApplicationAugust 7, 1946, Serial No. 688,944

This invention relates to an oil filter screen and more particularlyandspecifically to an oil filter screen adapted to be mounted in thecrankcase of an internal combustion engine on the suction side of theoil circulating pump of the lubricating system.

The primary object of this invention isto provide an eifective oilscreen of the type described which is thorough and dependable inoperation.

Another object of this invention is to provide an oil screen of the'typedescribed which may be easily and thoroughly cleaned with the minimum ofeffort.

Still a further object of this invention is to provide an oil screen ofthe type described which is of simple, sturdy and inexpensive design.

Still further objects and advantages of this invention will readilyappear to those skilled in the art when examined in the light of theaccompanying drawing, in which Figure 1 is a horizontal cross sectiontaken on line ll looking in the direction indicated by the arrows.

Figure 2 is a vertical cross section taken on line 2-2 looking in thedirection indicated by the arrows.

The filter comprising the present invention is illustrated and describedin an embodiment suitable for use in combination with a crankcase orsump of any engine having a lubricating oil system.

Describing the embodiment of the invention as illustrated in thedrawings, l designates the bottom of an engine crankcase or sump whichbottom is provided with an aperture I 2 through which the filter isinsertable and removable in the manner now to be described- A designatesa metal disk which isremovably secured to the crankcase bottom I bybolts 3 which extend upward through the disk A and through an oil tightgasket B to the sump bottom l and onward to engage a strengthening metalring 4.

Suitably secured as by welding 5 to the disk A is an inverted U-shapedsupport C, the top of which is positioned above the bottom of the sump.

Secured to this support C by means-oi two screws 6 and l is a plate Dabout the periphery of the upper side of which is a U-shaped channelway8 in which rests the lower edge of a tubular filter screen E, the upperedge of which properly supports a cap F by virtue of an invertedU-shaped channel-way 9 about the periphery of 3 Claims. (Cl. 210-149)the under side of cap F claimed is:

which receives and rests on the upper edge of the screen.

Secured to the under side of cap E at a 90 relationship are two U-shapedbraces Ill and II which extend downward adjacent to the screen walls todifierent depths within the screen where one brace III, the shorter,crosses over and within brace ll lying just above it in crossed positionas at l2.

These braces I 0 and II prevent the inward collapse of the screen E fromthe suctionpressure of the inlet tube G which passes downward throughthe cover F and is secured to it by the nuts l3 and I4 and terminates ata spaced distance from plate D within the screen E.

In order to clean the screen E the screws 3 are removed and the metaldisk A is lowered from its juxtaposition with the bottom of thecrankcase and thereby lowering the support C and plate D through theaperture 2 and screen E by virtue of its operative fit with the cap F islowered from the crankcase along with plate D and disk A to a freeposition outside the crankcase.

After the support, plate and screen have been removed from thecrankcase, the screen E may be lifted from the channel 8 in plate D andcleaned or replaced before reinserting the filter to position within thecrankcase.

Having thus described the invention what is 1. For use in the crankcaseof an engine having an oil circulating system means provided with aninlet tube in the crankcase, a strainer, comprising a support having atop elevated above the crankcase bottom, a plate on said support andhaving'its upper face at its peripherial edge provided with achannel-way; a'tubular screen having its lower end supported in saidchannelway, a cover having at the peripherial edge of its under side aninverted U-shaped channelwayreceiving and resting upon the upper end ofsaid screen and closing the upper end thereof, and the inlet tubeextending through said cover and having its inlet end terminating withinsaid screen and in spaced relationship above said plate.'

2. For use in the crankcase of an engine having an oil circulatingsystem provided with an inlet tube in the crankcase, a strainercomprising a support having its top elevated above the crankcase bottom,a plate on said support, a tubular screen the lower edge of which restsin a channel-way about the periphery of the upper face of said plate, acover for said screen having an inverted U-shape'd channel-way about theperiphery of its under side which receives and rests on the upper edgeof said screen and. closing the upper end thereof, two U-shaped bracessecured to the under side of said cover at 90in' tervals and extendingdownward adjacent to the walls of the tubular screen to 'difierentdepths within the screen so that one crosses over and within the otherthus preventing the inward collapse of said screen caused by the suctionpressure of the inlet tube which extends through the cover andterminates within the screen in spaced relationship above the plate.

3. In an engine having a crankcase and oil circulating means drawing oilfrom said crank case, a flat disk having a support thereon the top ofwhich is elevated above the bottom of the crankcase, said disk beingremovably secured to the bottom of the crankcase to cover an aperturetherein, a plate secured on said support, a tubu'- REFERENCES CITED Thefollowing references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1 0l9,,l7l Melville-Hamilton Mar.5, 1912 1,394,011 Hills Oct. 18, 1921 1,759,447 Fisher May 20, 19302,196.821 Arnold Apr. 9, 1940 2,372,286 7 Mieras Mar. 27, 1945

